The absorbance of a solution per unit of path length and per unit concentration; a = A/(bc) where a, A, b, and c are the absorptivity, absorbance, path length, and concentration, respectively. Absorpt [..]

The efficiency of radiation absorption.

The fraction of incident radiation that is absorbed by matter. Absorptivity may be a function of wavelength and/or direction, and is related to the emissivity of the region by Kirchhoff's law. Th [..]

Of a material propagation medium, absorptance per unit path length.

The fraction of incident radiation absorbed by a surface, a.

Absorptivity is the absorption cross section or extinction coefficient. Absorptivity varies with wavelength and is defined as the absorbance of a solution per unit path length and concentration: a = A [..]

The quality of being absorptive; absorptiveness.

(n) (physics) the property of a body that determines the fraction of the incident radiation or sound flux absorbed or absorbable by the body

Synonyms: specific absorption coefficient, molar absorption coefficient. (05 Mar 2000)

The quality of being absorptive; absorptiveness. First attested in the mid 19^th century.SOED5|page=9 (thermodynamics) The fraction of radiation absorbed by a surfac [..]